<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="cart, index in cartInfoList" :key="index">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cart.isChecked === 1" @change="updateChecked(cart, $event)">
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl">
            <div class="item-msg">{{ cart.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ cart.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <button style="background:white" :disabled="cart.skuNum > 1 ? false : true" class="mins"
              @click="handler('minus', -1, cart)">-</button>
            <input autocomplete="off" type="text" :value="cart.skuNum = cart.skuNum < 1 ? 1 : cart.skuNum" minnum="1"
              @change="handler('change', $event.target.value * 1, cart)" class="itxt">
            <button style="background:white" class="plus" @click="handler('add', 1, cart)">+</button>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cart.skuNum * cart.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteCartById(cart.skuId)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllChecked" @click="updateAllCartChecked($event)">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="                                                                                             (``)">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{ alterNum }} </span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link to="/trade" class="sum-btn">结算</router-link> 

        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapGetters } from 'vuex';
import throttle from "lodash/throttle";
export default {
  name: 'ShopCart',
  computed: {
    ...mapGetters('shopcart', ['cartList']),
    cartInfoList() {
      return this.cartList.cartInfoList || []
    },
    totalPrice() {
      let totalPrice = this.cartInfoList.filter(item => {
        return item.isChecked == 1
      }).reduce(
        (pre, cur) => pre + cur.skuNum * cur.skuPrice, 0
      )
      return totalPrice
    },
    //判断底部复选框是否勾选
    isAllChecked() {
      //遍历数组里只要全部元素isChecked属性都为1==》真
      // 只要有一个不是1==》假
      return this.cartInfoList.every(info => info.isChecked == 1)
    },
    alterNum(){
      return this.cartInfoList.filter(item => item.isChecked).length
    }
  },
  mounted() {
    this.getData()
    console.log();
  },
  methods: {
    getData() {
      this.$store.dispatch("shopcart/getCartList");
    },
    // 修改某一个产品的个数
    handler: throttle(
      async function (type, disNum, cart) {
        //type:为了区分三种操作
        //目前disNum形参：+变化量（1），-变化量（-1） input最终的个数（并不是变化量）
        // cart：那一个产品（身上有id）S
        // 向服务器发请求，修改数量
        switch (type) {
          case 'add':
            //带给服务器变化量
            break;
          case 'minus':
            //如果产品的个数大鱼1，才可以传递给服务器-1
            // 如果产品的个数小于等于1，传递给服务器个数为0(原封不动)
            disNum = cart.skuNum > 1 ? -1 : 0;
            break;
          case 'change':
            if (isNaN(disNum) || disNum < 1 || disNum - parseInt(disNum) > 0) {
              disNum = 0;
              console.log('输入不合法')
            } else (
              disNum = parseInt(disNum) - cart.skuNum
            )
            break
            ;
        }
        //派发action
        try {
          await this.$store.dispatch('detail/addOrUpdateShopcart', { skuId: cart.skuId, skuNum: disNum });
          this.getData()
        } catch (error) {
          alert(error.message)
        }
      }, 500
    ),
    async deleteCartById(skuId) {
      try {
        //如果删除成功再次发请求获取新的数据进行展示
        await this.$store.dispatch('shopcart/deleteCartListBySkuId', skuId)
        this.getData()
      } catch (error) {
        alert(error.message);
      }
    },
    //修改某个产品的勾选状态
    async updateChecked(cart, $event) {
      //带给服务器的参数不是Boolean，以为0|1
      try {
        await this.$store.dispatch('shopcart/updateCheckedById', { skuId: cart.skuId, isChecked: Number($event.target.checked) })
        this.getData()
      }
      catch (error) {
        alert(error.message)
      }
    },
    //删除全部选中的产品
    //这个回调函数咱门没办法手机到一些有用数据
    async deleteAllCheckedCart() {
      try {
        //派发一个action
        await this.$store.dispatch("shopcart/deleteAllCheckedCart");
        //再发请求获取购物车列表
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    },
    //修改全部产品的选中状态
    async updateAllCartChecked(event) {
      try {
        let isChecked = event.target.checked ? "1" : "0";
        //派发action
        await this.$store.dispatch("shopcart/updateAllCartIsChecked", isChecked);
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    },
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      &>div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        &>li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>